Cyber Threat Intelligence
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Ransomware Victim Financial Services

Mercer Advisors

Ransomware attack by Shinyhunters · Disclosed February 24, 2026 · 🇺🇸 United States

Date Disclosed
Feb 24, 2026
2026
Threat Group
Shinyhunters
139 total victims
Country
🇺🇸 United States
Industry
Financial Services

ThreatAI Analysis

Compiled from this incident record and the threat intelligence profile for Shinyhunters. Figures and technique mappings are quoted from the source data, not inferred.

About the Shinyhunters group

ShinyHunters is a financially motivated data-theft and extortion group active since 2020, responsible for high-profile breaches including Ticketmaster (via Snowflake) and PowerSchool; by 2025 they launched a RaaS offering called "shinysp1d3r," and in August 2025 French authorities arrested four members. Shinyhunters has listed 139 victims since April 2024.

How Shinyhunters is documented to operate

Data from Information Repositories T1213 Collection

Adversaries may leverage information repositories to mine valuable information. Information repositories are tools that allow for storage of information, typically to facilitate collaboration or information sharing between users, and can store a wide variety of data that may aid adversaries in further objectives, such as Credential Access, Lateral Movement, or Defense Evasion, or direct access to the target information. Adversaries may also abuse external sharing features to share sensitive documents with recipients outside of the organization (i.e., Transfer Data to Cloud Account).

Mitigations: User Training, Out-of-Band Communications Channel, User Account Management, Multi-factor Authentication, Software Configuration, Audit

MITRE ATT&CK reference →
Exfiltration Over Web Service T1567 Exfiltration

Adversaries may use an existing, legitimate external Web service to exfiltrate data rather than their primary command and control channel. Popular Web services acting as an exfiltration mechanism may give a significant amount of cover due to the likelihood that hosts within a network are already communicating with them prior to compromise. Firewall rules may also already exist to permit traffic to these services. Web service providers also commonly use SSL/TLS encryption, giving adversaries an added level of protection.

Mitigations: Restrict Web-Based Content, Data Loss Prevention

MITRE ATT&CK reference →
Data Encrypted for Impact T1486 Impact

Adversaries may encrypt data on target systems or on large numbers of systems in a network to interrupt availability to system and network resources. They can attempt to render stored data inaccessible by encrypting files or data on local and remote drives and withholding access to a decryption key. This may be done in order to extract monetary compensation from a victim in exchange for decryption or a decryption key (ransomware) or to render data permanently inaccessible in cases where the key is not saved or transmitted.

Mitigations: Data Backup, Behavior Prevention on Endpoint

MITRE ATT&CK reference →

MITRE ATT&CK techniques attributed to Shinyhunters across its recorded activity, not a finding about how Mercer Advisors was reached.

Vulnerabilities Shinyhunters is recorded exploiting

2 of these 2 are in the CISA Known Exploited Vulnerabilities catalog, 1 of them recorded by CISA as used in ransomware campaigns. CVEs attributed to Shinyhunters across its reported activity. There is no indication that any of these was involved in the Mercer Advisors incident — the source data does not record an entry point.

Incident Analysis

Mercer Advisors was targeted by Shinyhunters ransomware, one of the most active ransomware groups in our database with 139 confirmed victims globally. The attack was disclosed on February 24, 2026, when Mercer Advisors appeared on the group's dark web leak site.

Mercer Advisors is based in United States , operating in the Financial Services sector. United States ranks #1 globally for ransomware attacks, with 9,099 victims in our database.

Sector context: Financial sector organisations are targeted for their access to funds, sensitive financial data, and the reputational damage a public breach can cause. Regulatory requirements also increase recovery costs.

Shinyhunters typically employs a double extortion model: first exfiltrating sensitive data from the victim's systems, then deploying ransomware to encrypt files. Victims face two simultaneous threats — paying to restore access and paying to prevent publication of stolen data. The group's leak site publishes victim names and exfiltrated data as leverage.

Data source: This incident record is sourced from public ransomware group leak site disclosures aggregated via the ransomware.live API. Disclosure date reflects when the victim was published on the leak site, which may differ from the initial date of compromise. This platform does not publish or link to stolen data. Last data update: Aug 10, 2026 08:00 UTC.

Frequently Asked Questions

Was Mercer Advisors attacked by ransomware?

Yes. Mercer Advisors was listed as a victim of the Shinyhunters ransomware group on February 24, 2026. The organisation is based in United States and operates in the Financial Services sector. The disclosure appeared on the group's dark web leak site.

Which ransomware group attacked Mercer Advisors?

Mercer Advisors was attacked by Shinyhunters ransomware. Shinyhunters is one of the most active ransomware groups, having claimed 139 victims globally. The group typically employs a double-extortion model: encrypting the victim's files and threatening to publish stolen data.

When did the Mercer Advisors ransomware attack occur?

The ransomware attack on Mercer Advisors was disclosed on February 24, 2026. This date reflects when the victim was published on the threat group's leak site, which may differ from the actual date of initial compromise.

What data was stolen in the Mercer Advisors ransomware attack?

The specific data stolen from Mercer Advisors has not been independently verified by this platform. Ransomware groups typically exfiltrate data before encrypting systems and use the threat of publication to pressure victims. As a Financial Services organisation, Mercer Advisors likely held financial records, client data, and transaction histories.

How can organisations protect against Shinyhunters attacks?

To defend against Shinyhunters and similar threat actors, organisations should: maintain regular offline backups tested for restoration; implement network segmentation to limit lateral movement; deploy multi-factor authentication on all remote access; use endpoint detection and response (EDR) tools; conduct regular phishing and security awareness training; and monitor threat intelligence feeds for indicators of compromise (IOCs) associated with active groups.